Magnetic strengthening - Novel approach for material strengthening-

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22052
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: National Institute for Materials Science (2021); Kyoto University (2019-2020)
• Principal Investigator: NIITSU Kodai 国立研究開発法人物質・材料研究機構, マテリアル基盤研究センター, 独立研究者 (90733890)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 格子欠陥 / 磁性 / 局在磁性 / 電子線ホログラフィー / 塑性変形

Outline of Final Research Achievements

Through mechanical tests under a magnetic field and magnetization measurements under the introduction of plastic strain, I succeeded in measuring magnetic properties in defects such as dislocations. I also succeeded in observing the magnetic order localized in dislocations by means of electron holography. It has been confirmed that the plastic deformation behavior of such materials changes depending on the presence or absence of a magnetic field, and the existence of magnetic strengthening, which is the goal of this study, was confirmed. In the future, the origin of this phenomenon will be clarified by investigating the dislocation substructures after deformation.

Free Research Field

金属物性

Academic Significance and Societal Importance of the Research Achievements

転位や逆位相強化に局在する磁気秩序の観測・観察に成功し、さらに磁場の有無に応じて塑性変形挙動が変化することを確認した。この挙動は、塑性流動において磁場が有意な影響をもたらしうることを示した成果であり従来の強化機構とは全く異なる、外場による材料強化が可能であることを示す。材料強化法を多様化に貢献することで構造材料をはじめとする材料の機能を豊かにすることが期待される。